Latency numbers like this are really meaningless, and only give you an idea of the *potential* minimum latency of a card on a specific system.
I guarantee that you will not work on more than a couple tracks, if that, if you've configured your system for 1ms of latency. In fact, if you plan on working on typical 16+ track projects, your latency will typically be around 50-60ms, and that's fine for mixing.
The only time latency is a serious issue is when you're doing live input processing...that is, applying effects WHILE recording. If you're not doing this, don't worry about it. You should adjust your buffers such that you can work without a lot of dropouts. If you are doing live input processing, then you'll have to work with smaller submixes for it to be feasible. As a rule, you'll need to get your latency down to under 10ms for the delay to be nearly unnoticable. On most systems, getting latency values that low will require that you seriously limit the number of tracks and effects you're working with (hence using submixes).
Slackmaster 2000